and a mississippi senator. federal agents say they have arrested 45 year-old paul capt. curtihave bkevin curtis of mississippi. the deadly substance inside those letters is known as ricin. both letters were intercepted at screening facilities and both were postmarked memphis tennessee april 8th. the white house says that for stolid careful drill in handling the letters and one was injured. >> we wait for a possible of arrests as they believe they may have identified a suspect on video in the bombing of the boston marathon on monday. >> 7:13 a.m. and we'll be back with more in just a couple of minutes. a live look from our mt. tam cam. this shows you clear conditions, we will have a nice day. we will start getting the warm-up as we head into the weekend. and george has a continuing look at the hot spot on westbound 580. [ male announcer ] you think you know me. i'm just red carpets and big spectacles. but that's only the beginning. i have more than one red carpet. i like all sorts of spectacles. from the grandio